I was hoping to compile an accurate list of flight numbers for US and Canadian regional carriers for work. For example, all Acey flights operating for Delta are XXXX series, all Skywest flights operating for USAirways are XXXX series, etc. I can't seem to find a comprehensive list anywhere, so where better to ask? Thanks!

Quoting highflyer9790 (Reply 10):Any US Airways 4 digit flight number beginning with 2 such as 2487 is operated by PSA Airlines, either a CRJ-200 or CRJ-701.

Not all of them.

For US Airways Express:

2200-2599 is PSA. Furthermore, the -700s usually operate the 22XX flights.
2600-2849 is Mesa
2850-2999 is SkyWest
3000-3099 is Chautauqua
3100-3499 is Republic
3500-3550 is Trans States
3551-4099 is Air Wisconsin, although I really don't recall hearing very many of them in the 4000 range
4100-4649 is Piedmont